Xérxēs (Ξέρξης) is the Greek and Latin (Xerxes, Xerses) transliteration of the Old IranianXšaya-ṛšā ("ruling over heroes"), a popular name amongst the rulers of the PersianAchaemenid Empire.[1]
These rebellions help explain Antiochus' subsequent aggressive policy toward his satrap Xerxes. By 212 BC, Antiochus III had invaded the domain of Xerxes and defeated him after laying siege to the city of Arsamosata.[5] Shortly afterwards Antiochus III arranged for Xerxes to marry his sister, Antiochis.[6] However, within the same year she arranged to have her new husband assassinated, thinking that her brother would then be able to take control of Sophene. Whether Xerxes still ruled Commagene by the time of his assassination is not known.
Gaggero, Gianfranco (2016). "Armenians in Xenophon". Greek Texts and Armenian Traditions: An Interdisciplinary Approach. De Gruyter. The above mentioned Orontids..[..]..but also because the two satraps who were contemporaries of Xenophon's are explicitly stated to be Persian.
Diodorus Siculus (1954). Book XIX. Harvard University Press MCMLIV. p. 31. Clarification: this source supports the Orontid Armenian descent
Sullivan (1977). ANRW 2:8. pp. 743–748..
Strootman, Rolf (2021). 'Orontid kingship in its Hellenistic context: The Seleucid connections of Antiochos I of Commagene'. M. Blömer, S. Riedel, M. J. Versluys, and E. Winter eds., Common Dwelling Place of all the Gods: Commagene in its Local, Regional and Global Hellenistic Context. Oriens et Occidens: Stuttgart : Franz Steiner Verlag. pp. 296, 298–300. His Persianism meanwhile was a constructed identity with contemporaneous aims and not a case of real 'continuity'. The historical roots of the Commagenian dynasty – whether Persian, Armenian, Macedonian or a mixture of all that – have little relevance for understanding Antiochos' dynastic policy, which can best be understood in the context of its own time rather than from the Persian 'traditions' that Antiochos presents to us but are not attested in Commagene before his reign.[...]The dual rows of stelae on both the east and west terrace (fg 2) represent Antiochos' progonoi in respectively the male and female line: the first traces his ancestry through Commagenian kings and Armenian satraps to the Achaemenid dynasty (EN I, 1–15; WS I, 1–15);[...]As regards the historicity of Antiochos' Achaemenid ancestry: a marital bond between the Orontid rulers of Armenia and the Achaemenid dynasty has indeed been attested, and is referred to on Nemrud Dağ by the mentioning of Rhodogune, daughter of Artaxerxes II, on stele 6, which is dedicated to the first of the Armenian satraps, Aroandas/Orontes I (Artaxerxes II precedes him on stele 5): "Aroandas son of Artasuras, who married Queen Rhodogune, daughter of Artaxerxes". A weak link, however, appears in the form of the first Commagenian ruler, Ptolemaios, who is supposed to be the connection between on the one hand the rulers of Commagene and on the other hand the Orontid kings of Armenia. The Armenian Orontids controlled Commagene as part of their holdings until it became a separate administrative unit or kingdom within the Seleucid Empire, perhaps in the reign of Antiochos III the Great. Next to nothing, however, is known about this Ptolemaios, who ruled as an independent Seleucid client from ca. 163 or 150 BCE. While the link between the Achaemenids and the Orontids of Armenia is indicated by the mentioning of Rhodogune, a connection between Ptolemaios and the Armenian Orontids is conspicuously absent, though a marital link is not in itself impossible.
Toumanoff, Cyril (1963). Studies in Christian Caucasian History. Georgetown University Press.